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Gas Turbines: Heat Transfer

Passive Effusion Cooling in a Rectangular S-Bend Diffuser

[+] Author and Article Information
B. C. N. Ng

Department of Mechanical and Materials Engineering,  Queen’s University, McLaughlin Hall, Kingston, ON, K7L 3N6, Canadangb@appsci.queensu.ca

A. M. Birk

Department of Mechanical and Materials Engineering,  Queen’s University, McLaughlin Hall, Kingston, ON, K7L 3N6, Canadabirk@me.queensu.ca

The term “convex” and “concave” surfaces are used in the paper instead of suction surface/inner wall that were used in the reviewed literature.

J. Eng. Gas Turbines Power 134(9), 091901 (Jul 23, 2012) (6 pages) doi:10.1115/1.4006987 History: Received June 17, 2012; Revised June 19, 2012; Published July 23, 2012; Online July 23, 2012

The experimental study considered passive effusion cooling in an S-bend diffusing passage in which ambient cool air was drawn naturally into the S-bend passage with subatmospheric flow distributions. Seven-hole pressure probes were used to measure the test section’s inlet and outlet flow conditions which were used to evaluate the performance of the S-bend diffuser. Back-pressure, outlet flow-fields, and wall pressure distributions were investigated to study the effects of effusion cooling on the pressure recovery performance of the S-bend diffuser. The study revealed a substantial back-pressure penalty and wall pressure distribution alteration in the S-bend passage with full coverage effusion cooling. The outlet diffuser was shown to be not as effective with effusion cooling. The findings highlighted the importance of the design of effusion holes locations in complex flow passages.

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Copyright © 2012 by American Society of Mechanical Engineers
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Figures

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Figure 1

Geometry of S-bend diffuser

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Figure 2

Inlet pressure of noncooling S-bend with/without diffusing passage

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Figure 3

Pressure change coefficients of S-bend diffuser with/without effusion cooling

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Figure 4

Normalized outlet axial velocity contours and velocity fields, top row with straight outlet, bottom row with AR 1.5 diffuser outlet

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Figure 5

Wall pressure distributions

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